<template>

    <section class="loginContainer">
      <div class="loginInner">
        <div class="login_header">
          <h2 class="login_logo">硅谷外卖</h2>
          <div class="login_header_title">
            <a href="javascript:;" :class="{on: loginWay}" @click="loginWay = !loginWay">短信登录</a>
            <a href="javascript:;" :class="{on: !loginWay}" @click="loginWay = !loginWay">密码登录</a>
          </div>
        </div>
        <div class="login_content">
          <form @submit.prevent="login">
            <div :class="{on: loginWay}">
              <section class="login_message">
                <input type="tel" maxlength="11" placeholder="手机号" v-model="phone">
                <button :disabled="!rightPhone" class="get_verification" 
                :class="{right_phone: rightPhone}" @click.prevent="getCode"> <!--.prevent 阻止默认事件（阻止表单默认提交事件）-->
                  {{ computeTime>0 ? `已发送（${computeTime}s）` : '获取验证码'}}
                </button>
              </section>
              <section class="login_verification">
                <input type="tel" maxlength="8" placeholder="验证码" v-model="code">
              </section>
              <section class="login_hint">
                温馨提示：未注册硅谷外卖帐号的手机号，登录时将自动注册，且代表已同意
                <a href="javascript:;">《用户服务协议》</a>
              </section>
            </div>
            <div :class="{on: !loginWay}">
              <section>
                <section class="login_message">
                  <input type="text" maxlength="11" placeholder="手机/邮箱/用户名" v-model="name">
                </section>
                <section class="login_verification">
                  <input type="text" maxlength="8" placeholder="密码" v-if="showPwd" v-model="pwd"><!--input提交数据命名必须要跟接口相应数据命名保持一致-->
                  <input type="password" maxlength="8" placeholder="密码" v-else v-model="pwd">
                  <div class="switch_button" :class="showPwd ? 'on' : 'off'" @click="showPwd = !showPwd">
                    <div class="switch_circle" :class="{right: showPwd}"></div>
                    <span class="switch_text">{{showPwd ? 'abc' : '...'}}</span>
                  </div>
                </section>
                <section class="login_message">
                  <input type="text" maxlength="11" placeholder="验证码" v-model="captcha">
                  <img class="get_verification" src="http://localhost:4000/captcha" alt="captcha" ref="captcha" @click="getCaptcha">
                </section>
              </section>
            </div>
            <button class="login_submit">登录</button>
          </form>
          <a href="javascript:;" class="about_us">关于我们</a>
        </div>
        <a href="javascript:" class="go_back" @click="$router.back()">
          <i class="iconfont icon-jiantou"></i>
        </a>
      </div>

      <AlertTip :alertText="alertText" v-show="alertShow" @closeTip="closeTip"></AlertTip>
    </section>
</template>

<script>
import AlertTip from '../../components/AlertTip/AlertTip.vue';
import {reqPwdLogin, reqSendCode, reqSmsLogin} from '../../api'

export default {
  data () {
    return {
      loginWay: true,  //true代表短信登录，false代表密码登录
      showPwd: false, //是否显示密码
      phone: '', //输入的手机号
      code: '', //短信验证码
      name: '',//用户名
      computeTime: '',//验证码倒计时
      pwd: '', //用户密码
      captcha: '', //图像验证码
      alertText: '',  //提示文本
      alertShow: false  //是否显示提示框
    }
  },
  computed: {
    //根据手机号的正确性判断类名，用计算属性
    rightPhone () {
      return /^1[3-9]\d{9}$/.test(this.phone)
    }
  },
  methods: {
    //异步获取短信验证码
    async getCode () {
      //如果当前没有计时
      if (!this.computeTime) {
         //启动倒计时
        this.computeTime = 60
        this.intervalId =  setInterval(() => {
          this.computeTime--;
          if (this.computeTime <= 0) {
          //停止计时
          clearInterval(this.intervalId)
          }
        }, 1000)
      }
     
      //发送ajax请求（向指定手机号发送验证码请求）
      const result = await reqSendCode(this.phone)
      if (result.code === 1) {
        //显示提示
        this.showAlert(result.msg)
        //停止计时
        if (this.computeTime) {
          this.computeTime = 0
          clearInterval(this.intervalId)
          this.intervalId = null
        }
      }
    },

    showAlert (alertText) {
      this.alertShow = true
      this.alertText = alertText
    },
    //异步登录
     async login () {
       let result
      //前台表单验证
        if (this.loginWay) {
          //短信登录
          const {rightPhone, phone, code} = this
          if (!this.rightPhone) {
            //手机号不正确
            this.showAlert('您输入的手机号有误')
            return
          } else if (!/^\d{6}$/.test(code)) {
            //验证码必须是6位数字
            this.showAlert('您输入的验证码有误')
            return
          }
          //发送ajax请求短信登录
          result = await reqSmsLogin(phone, code)
        } else {
          const {name, pwd, captcha} = this
          //密码登录
          if (!this.name) {
            //必须指定用户名
            this.showAlert('用户名不能为空')
            return
          } else if (!this.pwd) {
            //必须指定密码
            this.showAlert('密码不能为空')
            return
          } else if (!this.captcha) {
            //必须指定验证码
            this.showAlert('验证码不能为空')
            return
          }
          //发送ajax请求密码登录
          result = await reqPwdLogin({name, pwd, captcha})
      }

      //停止计时
      if (this.computeTime) {
        this.computeTime = 0
        clearInterval(this.intervalId)
        this.intervalId = null
      }

      //根据结果处理数据
      if (result.code === 0) {
        const user = result.data
        //将User保存到vuex的state中
        this.$store.dispatch('recordUser', user)
        //去个人中心界面
        this.$router.replace('/profile')
      } else {
        //显示新的图片验证码
        this.getCaptcha()
        //显示警告提示
        const msg = result.msg
        this.showAlert(msg) 
      }
    },
    //关闭提示框
    closeTip () {
      this.alertShow = false
      this.alertText = ''
    },
    //获取新的图片验证码
    getCaptcha () {
      //每次指定的src要不一样
      this.$refs.captcha.src = 'http://localhost:4000/captcha?time=' + Date.now()
    }
  },
  components: {
    AlertTip
  }
  
}
</script>

<style lang="stylus" scoped>
@import "../../common/stylus/mixins.styl"
.loginContainer
    width 100%
    height 100%
    background #fff
    .loginInner
      padding-top 60px
      width 80%
      margin 0 auto
      .login_header
        .login_logo
          font-size 40px
          font-weight bold
          color #02a774
          text-align center
        .login_header_title
          padding-top 40px
          text-align center
          >a
            color #333
            font-size 14px
            padding-bottom 4px
            &:first-child
              margin-right 40px
            &.on
              color #02a774
              font-weight 700
              border-bottom 2px solid #02a774
      .login_content
        >form
          >div
            display none
            &.on
              display block
            input
              width 100%
              height 100%
              padding-left 10px
              box-sizing border-box
              border 1px solid #ddd
              border-radius 4px
              outline 0
              font 400 14px Arial
              &:focus
                border 1px solid #02a774
            .login_message
              position relative
              margin-top 16px
              height 48px
              font-size 14px
              background #fff
              .get_verification
                position absolute
                top 50%
                right 10px
                transform translateY(-50%)
                border 0
                color #ccc
                font-size 14px
                background transparent
                &.right_phone
                  color black 
            .login_verification
              position relative
              margin-top 16px
              height 48px
              font-size 14px
              background #fff
              .switch_button
                font-size 12px
                border 1px solid #ddd
                border-radius 8px
                transition background-color .3s,border-color .3s
                padding 0 6px
                width 30px
                height 16px
                line-height 16px
                color #fff
                position absolute
                top 50%
                right 10px
                transform translateY(-50%)
                &.off
                  background #fff
                  .switch_text
                    float right
                    color #ddd
                &.on
                  background #02a774
                >.switch_circle
                  //transform translateX(27px)
                  position absolute
                  top -1px
                  left -1px
                  width 16px
                  height 16px
                  border 1px solid #ddd
                  border-radius 50%
                  background #fff
                  box-shadow 0 2px 4px 0 rgba(0,0,0,.1)
                  transition transform .3s
                  &.right
                    transform translateX(28px)
            .login_hint
              margin-top 12px
              color #999
              font-size 14px
              line-height 20px
              >a
                color #02a774
          .login_submit
            display block
            width 100%
            height 42px
            margin-top 30px
            border-radius 4px
            background #4cd96f
            color #fff
            text-align center
            font-size 16px
            line-height 42px
            border 0
        .about_us
          display block
          font-size 12px
          margin-top 20px
          text-align center
          color #999
      .go_back
        position absolute
        top 5px
        left 5px
        width 30px
        height 30px
        >.iconfont
          font-size 20px
          color #999
</style>